This study aims to determine: 1) The level of students’ science process skills before and after being taught using PhET simulation media. 2) The improvement of students’ science process skills who were taught using PhET simulation media. 3) Whether there was an effect of the PhET simulation media on the students’ science process skills. This study is classified as a Quasi Experimental study using a Nonequivalent Control Group Design. The population in this study included all VIII grade students at SMPN 18 Makassar. Sampling was conducted using purposive sampling. Data were collected through pretests and posttests and analyzed using descriptive and inferential statistics. The analysis results show: 1) The average science process skills of students before learning using the PhET simulation media was 24.52, which falls into the low category, while after learning it increased to 69.84, which falls into the high category. 2) There was an increase in science process skills after using the PhET simulation media, with an N-Gain value of 0.59 which falls into the medium category. 3) There was an effect of PhET simulation media on the science process skills of students in class VIII SMPN 18 Makassar.
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